Fe-Ti系の相互拡散

抄録

Interdiffusion in Fe-Ti alloys was studied in the temperature range between 700° and 1300°C, using diffusion couples of pure metals or pure metal and alloys. The Balluffi method was used to determine the interdiffusion coefficient \ ildeD in both the Fe-rich and Ti-rich solid solutions, taking into account the variations of the atomic volume with composition.
From the Arrhenius relationship, the activation energy \ ildeQ and the frequency factor \ ildeD₀ for the interdiffusion were calculated. The results showed that \ ildeQ was considerably low in the β_Ti phase, especially at the Ti-rich side, in agreement with the case of tracer diffusion.
Measurements of the Kirkendall effect suggested that diffusion in this alloy was controlled by the vacancy mechanism.
Formation of the intermetallic phases was not found in the interdiffusion couple of pure metals and the possible reasons for this were discussed.